This retrospective clinical and radiographic study concerns 75 cases of craniosynostoses among 850 cases operated in the Craniofacial Unit of Necker's Hospital for Sick Children (1976-1988, Paris, France). The correlation between frontal sinus development and glabellar morphology was analyzed. When there was a significant advancement of the supraorbital ridge the projection of the glabella was satisfactory without any frontal sinus. When no significant advancement was performed, the pneumatization of the frontal bone was as frequent as in the general population and was dependent upon the underlying frontal sinus.